I have been using my 80mm (400mm focal length) long enough now that I had forgotten what a difference there was to my 104mm Mak (1,325mm focal length). Any tracking error is magnified 3 times. Polar alignment has to be more precise.
I decided to try M57 last night with my 104mm Mak....without a focal reducer on the camera. I probably should have waited for a better night. The sky seemed to improve about 2:30am, but by then I was putting my gear away. During the imaging, there was a lot of haze....the sky was almost a light grey at times. I decided to go ahead because M57 was virtually overhead.
104mm Maksutov-Cassegrain, CG5 GoTo mount, Orion StarShoot II color
I ran two sequences. A: 40 subs @ 30 sec per sub = 20 minutes
B: 60 subs @ 20 sec per sub = 20 minutes
: This is the best of my original processing of sequence A. Although I spent a lot of time focusing, the images don't reflect it......not sure whether to blame the 'seeing' or my focusing skills. Could be both.
: Did some reprocessing. (used 23 subs from sequence A)
I think this image looks a little more "natural". Much more like the telescope image....although it still doesn't have that whispy....cloud-like appearance, or the detail I was hoping for. I will keep at it for better data.